2000 DESCRIPTION

BACKGROUND OF THE INVENTION

Technical Field

The present invention relates to a J-Trim employed for a ceiling isolation board or panel so as to cover an end portion of a ceiling isolation board.

2005 Description of the Prior Art

In this document "J-Trim with a shadow line" can be referred to as "the shadow line J-trim" or "J-Trim shadow line."

To avoid confusion it is important to note that a J-trim can also be referred to as a J- 2010 Channel (United States and North America) and a J-Bead (Australia) in different countries of the world, whereas J-Trims, J-Beads and J-Channels can also be used around windows or doors and vertical drywalls for a neat trim effect. In essence J- channels and J-beads are the same type of trimming component as a J-Trim. Other type of trims also exist like U-Trims and H-Trims (two entry points to connect two 2015 drywalls or plaster boards; for example)

Plaster and other heavier drywall products require aluminium or steel J-Trims, J- Channels or J-Beads. Shadow line ceilings are currently especially used on plaster or gypsum board to neaten and tidy the ceiling. It is a modern way of tidying and 2020 clean-up ceilings to ensure clean and neat lines where the ceiling connects with the wall.

There is usually a space between 1 0 mm and 25 mm left open to ensure a shadow line effect between the wall and the ceiling.

2025

There are also prior art {Figure 1) steel made shadow line J-Trim's with insert space (101 ) between the base and the overlap (102) for fixing to a steel frame ceiling system for use as ceiling construction. In other words on the extended leg of the J the leg is folded back (103) to leave an insert (101 ) for fixing sliding space. This is 2030 specifically a steel or metal shadow line trim. It has to be fixed to a specific steel ceiling system grid.

More prior-art Shadow line Trim {Figure 2) is specifically designed for plaster boards (204), drywall and other products. Although not considered a J-Trim and just normal

2035 shadow line Trim, because the bottom lip is very short. This prior-art shadow line Trim has an extended leveller (201 ) on the overlap (202) to be of guidance to sidewalls (200) and not trusses or truss extensions like rafters etc. The long leg (203) of the prior art Trim is much-much longer than the lip (206) compared to the arm ratio of the invented Shadow line J-Trim. Short arm (206) is more considered a

2040 lip and rather a direction pointer and keeper for plaster board installation. Using this Trim one has to make use of specific plaster screws (205) to secure the plaster board. The plaster screws still need to get plastered over also or covered with paint etc. to make the ceiling neat. The lip (206) won't hold the plaster board or any other board in place or position like said invented trim. This is a very important aspect of 2045 the invention. According to this the invented Trim has a much longer leg on the

bottom end to make sure ceiling boards like polystyrene and PVC can be safely and securely installed and also be kept loose inside the invented J-Trim.

Furthermore prior art normal J-trim exist where in use there is no overlap (102) (202) (no shadow line). Only one long leg and one shorter leg usually half the long legs length exist.

2055

SUMMARY OF THE INVENTION

According to the invention new Polystyrene ceilings and new PVC ceilings can now be used with the Shadow line J-Trim as supposed to the prior-art gypsum or plaster

2060 board ceilings being used with specific prior art J-Trim Shadow lines.

According to the invention the polystyrene and PVC boards are light enough and the invented shadow line J-Trim strong enough to host the board loose permanently.

2065 Improved invention for PVC and Polystyrene board was required.

Firstly a Polystyrene ceiling with a J-Trim Shadow line is explained:

By introducing "A J-Trim with a shadow line" we want to improve the use of connecting this shadow line J-Trim to a thicker polystyrene ceiling board for the

2070 purpose of warm and cold weather isolation. Usually ceiling trims are not so thick or have in particular a narrow mouth with an opening mouth diameter of between 7 mm to say 12 mm.

The opening width of said trim will determine the width of the accompanying board.

2075

In order for a shadow line J-Trim to connect to a polystyrene isolation ceiling board in accordance with the present invention the shadow line J-Trim opening will be 25 mm to 35 mm or thicker for practical purposes of effective isolation. Contrary to the common PVC ceiling there are no normal J-Trims available on the market for a much 2080 thicker polystyrene ceiling board even if they are prior art shadow line J-Trims.

It is duly very important to note that the thickness of the polystyrene board is to ensure proper sturdiness and proper isolation for practical reasons and reliability. Typical ceiling polystyrene board is rigid and in extruded compress foam form that 2085 resembles something like a honeycomb. A thinner polystyrene board will simply

crack, splinter and definitely brake too easy. Regarding thermal insulation or isolation a thinner polystyrene board would not prevent heat or cold retention. Yes al buildings loose heat or cold retention over time but at least a thicker board will have much better isolation properties.

2090

The Shadow line J-Trim for specifically ceiling isolation board, double act as a ceiling and isolation board trim. Secondly a PVC ceiling with a J-Trim Shadow line is explained:

2095

Both the PVC and the polystyrene boards are not easily squared off or tidied at the ends against a wall and that's why conventional cornices are used if the job requires neatness which is mostly the case.

2100 It is important to understand that PVC ceilings are great first degree isolators,

meaning that warmer environments or an air-conditioned condoned area that is thermostat controlled don't require thick polystyrene boards.

PVC boards of a mere thickness from 6 mm are just as strong and rigid as a

2105 polystyrene board of say 30 mm. These are also the most common widths for both products in the market.

Accordingly to both Polystyrene and PVC boards explained above:

2110 It is an object of the invention to improve ceiling isolation to contribute to a more modern decorative look by introducing the Shadow line J-Trim.

Accordingly it is a further object to the invention that this shadow line

J-Trim approach can at least add dimension to an isolation purposed ceiling by 2115 adding a shadow line. This is the popular modern version and alternative to cornice ceilings.

Accordingly it is an object of the invention that the opening width of the Shadow line J-Trim will determine to fit to the width of the accompanying board meaning that 2120 different prior extruded invented J-Trim shadow line sizes can be made whereby the most popular standard sizes are 6-12 mm for PVC and 25 - 35 mm for polystyrene board. However 40-50 mm and 80 mm extruded invented shadow line J-Trim are also sometimes used for selected polystyrene applications.

It is further an object of the invention to provide a J-Trim shadow line made with 2125 inexpensive plastic or PVC which can be substituted for expensive steel and

aluminium shadow line trims. The said J-trim is easier to mount with a screw by hand or by screwdriver. The PVC is hence soft of nature and lightweight.

Therefore it is further an object of the present invention to provide a J-Trim shadow line which is inexpensive because of its easy construction and is possible to use in 2130 several other board ceilings and sidings made of other materials.

It is yet another object of the invention to provide a shadow line J-Trim to easily mount the overlap or long leg of the said trim onto the brandering, lath, trusses or rafters by means of screws, nails, rivets etc.

Yet further another object of the invention of the Shadow line J-Trim is that when 2135 there's action or movement on a wall or roof there will be less after effects as

opposed to normal cornices where it can be seen more easily. Cornices would normally make hair's-breadth cracks after wall or ceiling movement. Another object of the invention is that the PVC and Polystyrene boards are left loose 2140 inside the invented trim to make sure the ceiling can withstand movement damage.

More so another object of using the Shadow line J-Trim saves time and money because you only need to install the ceiling without a cornice; its saves on Cornice maintenance.

2145 Finally: according to the above "Summary of the invention": it is a final object of the invention to present a two piece J-Trim Shadow line in order to make installation easier. Due to the longer bottom leg 304(Fig 3) of the invented J-Trim it can be much more difficult to get a ceiling board into the mouth/opening of this invented J-Trim Shadow line compared to prior art short leg 206 (Fig 2). The ceiling board would

2150 normally have to get tilted quite a bit to go into the invented trim. Thus the inventors propose a two piece extendable Shadow line J-Trim (Fig 16) where the bottom piece inserts into an opening between two legs extending down from the top piece. The ceiling board must firstly be placed against the top piece and then the bottom piece gets inserted into the top piece securing the ceiling board to the invented J-Trim

2155 shadow line.

2160 BRIEF DESCRIPTION OF DRAWINGS

This invention will now be described, by way of example as portrayed in the "Summary", with reference to the following drawing(s):

2165 Figure 1 : Perspective view of prior art Shadow line J-Trim for fixing to a steel frame ceiling.

Figure 2: Perspective view of prior art Shadow line Trim used with plaster board.

2170 Figure 3: Side view of the invented Shadow line J-Trim.

Figure 4: Perspective view of invented one piece Shadow line Trim 402 and two piece click in Shadow line Trim 4022 used with ceiling board

2175 Figure 5: Example of a shadow line created between a ceiling and a wall.

Figure 6: Perspective 3D view from the right of invented Shadow line Trim

Figure 7: Perspective 3D view from the left of invented Shadow line Trim

2180

Figure 8: View from the top of invented Shadow line Trim

Figure 9: View from the bottom of invented Shadow line Trim 2185 Figure 10: View from the side of invented Shadow line Trim, right entry. Figure 11 : View from the side of invented Shadow line Trim, left entry.

Figure 12: Perspective view of invented two piece with two legs Shadow line Trim 2190 used with ceiling board.

Figure 13: View from the side of invented two piece with two legs and one click Shadow line Trim.

2195 Figure 14: View from the side of invented two piece with two legs and one click Shadow line Trim used with ceiling board.

Figure 15: View from the side of invented extendable two piece with two legs and three click's Shadow line Trim used with ceiling board.

2200

Figure 16: View from the side of invented extendable two piece with two legs and locking teeth

Shadow line Trim.

2205 Figure 17: View from the side of invented extendable two piece with two legs and locking teeth Shadow line Trim, used with ceiling board.

2210

DETAILED DESCRIPTION OF DRAWINGS

In Figure 3 the overlap 301 and outside rear leg 305 together ensures a shadow 2215 effect 306 against a wall. The top leg 302 together with the bottom leg 304 and inside rear leg 303 form the opening 302 where the ceiling board is inserted.

In Figure 4 the ceiling board 404 will be inserted at the opening 403 of the invented one piece shadow line J-Trim 402. The invented shadow line J-Trim 402 is already

2220 positioned against the wall 401 . Second embodiment in Figure 4 reveals the ceiling board 405 inserted into the Shadow line J-Trim. The invented Shadow line J-Trim FIG 3 has a much longer bottom leg 304 than prior art FIG 2's bottom leg 206. This means it's more difficult to insert a ceiling board from an angle into the opening of 302 than a prior art FIG 2 trim. This difficulty of inserting a ceiling board can be

2225 overcome by an invented two piece Shadow line J-Trim 4022. Ceiling board 4044 is first placed against top piece 4022 and then bottom piece 4033 is clicked in to form a sealed unit 4055.

In Figure 5 is an embodiment of a shadow line 502 between the ceiling board 501 2230 and the wall 503. In Figure 12 a two piece 1202 & 1204 Shadow line Trim is invented. Bottom piece 1204 connects into top piece 1202 at the invented two leg split opening 1206 with buttons 1207 clicking in. ^* See side view Figure 13.

2235

In another embodiment of Figure 12 above: in Figure 13 the bottom piece 1307 clicks into top piece 1302 where 1305 clicks together with 1304 and 1310 to form 1309 as a secured Trim.

2240 Figure 14 shows securing an inserted ceiling board 1408.

Figure 15 embodies an extension of a one click Shadow line J-Trim to a 2 and 3 click Shadow line J-Trim. Note the width of the Trims mouth can now be widened 1511 or narrowed 1512 to the width of the ceiling board 1508. This is now an invented 2245 extendable shadow line J-Trim.

In Figure 16 another type of extendable two piece 1602 & 1607 Shadow line J-Trim is invented. Bottom piece 1607 connects into top piece 1602 at the two leg split opening 1604 with as example but not limited teeth interlocking in the form of small 2250 square teeth 1603 or triangle shaped teeth 1601 to secure the Trim's two pieces 1602 & 1607. The Figure 16 J-Trim is an improvement on the Figure 15 J-Trim because the width of the chosen ceiling board can now be any reasonable width.

In Figure 17 an example of an extendable Shadow line J-Trim where the width size 2255 1709 & 1710 is embodied to show the invented J-trim can accommodate wider 1706 or narrower 1708 ceiling boards to any wished or preferred measure. The interlocking teeth can be separated by means of a human finger 1711 etc.